How to return the value of a PHP custom function?

Custom functions in PHP can return values ​​of specified types through the return statement, including strings, numbers, arrays, and objects. Practical case: - Return string: function greet($name) { return "Hello, $name!"; } - Return array: function get_user_data($id) { return ["name" => "John", "email " => "john@example.com"]; }

How to return the value of a custom function in PHP?

In PHP, custom functions can return values ​​of specified types. You can use the return statement to return a value, and the return value can be of various types, including strings, numbers, arrays, and objects.

Syntax:

function function_name(...$parameters): return_type
{
    // 函数体
    return $value;
}

Where:

• ##function_name is the name of the function.
• ...$parameters is an optional parameter list.
• return_type is the type of value returned by the function.
• return $value; is the return statement, used to specify the function return value.

Practical case:

The following is an example of a custom function that returns a string:

function greet($name)
{
    return "Hello, $name!";
}

$greeting = greet("John");
echo $greeting; // 输出: Hello, John!

The following is a custom function that returns an array Example of defining a function:

function get_user_data($id)
{
    $data = [
        "name" => "John",
        "email" => "john@example.com",
    ];

    return $data;
}

$user_data = get_user_data(1);
echo $user_data["name"]; // 输出: John

Tip:

Make sure the function return type matches the expected return value type.
• If a function does not explicitly specify a return type, it will return a
• null value.
You can use the
• void keyword to specify that a function will not return any value.

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